Maybe it was buried for a time in highly acidic soil and then cleaned so that it could be put back into circulation. I've found several cupro-nickel British 5p and 10p coins when metal detecting that looked like this after I'd cleaned them up.
Always show both sides of the coin instead of two of the same side. Looks like it has been attacked by something acidic. Whatever the cause, it is PMD as that could not happen during the striking of the coin.
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